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Full Discussion: [Solved] nfs share permissions with java
Top Forums UNIX for Advanced & Expert Users [Solved] nfs share permissions with java Post 302557263 by fwellers on Wednesday 21st of September 2011 10:39:46 AM
Old 09-21-2011
[Solved] nfs share permissions with java
Please bare with me while I try to explain this weird problem.

We are exporting a filesystem from an aix box to two linux boxes.
On the linux box a java-weblogic application hits the share.
For explanation benefits I'll describe the users thus.

aix filesystem owned by userA in groupA
on the linux systems we made the same user
so the shared files are also owned by userA and groupA.
The uids and gids are the same across the systems.

The java - weblogic application is started and runs (supposedly) as userB GroupB

On the linux systems we put userB in GroupA also. ( userB primary group B, and also in group A )

This means that if I put a file in the linux shared filesystem that is owned by userA groupA, if the permissions are 660, UserB can still read the file because he is in groupA.
This bears out with my tests. I can vi the file.

The problem is that when the application runs and does some java call to read the file, it gets permission denied. It cannot read the file unless I make the file have world read permissions. (at least 664 ).

My only guess is that somewhere in the stack between the Java, Weblogic, application ears, there is another uid being set and it is NOT userB who is trying to read the file.

But this same exact setup works perfectly on in our QA environment which is built the same ( supposedly ). The developers told me that there is no difference in weblogic or java on either system so if it's not working in prod, there must be something else in the configuration.
I checked the uids, gids, etc.. and they all look the same between the two systems.
The /etc/vstab is the same on all linux boxes with no options.
Same with the /etc/exports file on the aix box.

Now I am lost and don't know where to look.
Does anyone have any ideas where else I can look or how I can go forth troubleshooting this issue ?

Thanks !
Floyd

---------- Post updated 09-21-11 at 10:39 AM ---------- Previous update was 09-20-11 at 05:57 PM ----------

Problem solved.
I dropped the group entry for userb into groupa and readded.
works as advertised now.
 

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LEARN ABOUT DEBIAN

libglpk-java

libglpk-java(3) 					       libglpk-java overview						   libglpk-java(3)

NAME

       libglpk-java - GNU Linear Programming Kit Java Binding

DESCRIPTION

       The  GNU  Linear  Programming  Kit  (GLPK)  package supplies a solver for large scale linear programming (LP) and mixed integer programming
       (MIP).  The GLPK project is hosted at http://www.gnu.org/software/glpk.

       It has two mailing lists:
       - help-glpk@gnu.org and
       - bug-glpk@gnu.org.

       To subscribe to one of these lists, please, send an empty mail with a Subject: header line of just "subscribe" to the list.

       GLPK provides a library written in C and a standalone solver.  The source code provided at ftp://gnu.ftp.org/gnu/glpk/ contains	the  docu-
       mentation of the library in file doc/glpk.pdf.

       The Java platform provides the Java Native Interface (JNI) to integrate non-Java language libraries into Java applications.

       Project GLPK for Java delivers a Java Binding for GLPK. It is hosted at http://glpk-java.sourceforge.net/.

       To report problems and suggestions concerning GLPK for Java, please, send an email to the author at xypron.glpk@gmx.de.

ARCHITECTURE

       A GLPK for Java application will consist of the following
       - the GLPK library
       - the GLPK for Java JNI library
       - the GLPK for Java class library
       - the application code.

GLPK LIBRARY

       The GLPK library can be compiled from source code. Follow the instructions in file INSTALL provided in the source distribution. Precompiled
       packages are available in many Linux distributions.

       The usual installation path for the library is /usr/local/lib/libglpk.so.  The library has to be in the search path for binaries.

GLPK FOR JAVA JNI LIBRARY

       The GLPK for Java JNI library can be compiled from source code. Follow the instructions in file INSTALL provided in  the  source  distribu-
       tion.

       The  usual installation path for the library is /usr/local/lib/jni/libglpk-java.so.  The library has to be in the search path for binaries.
       Specify the library path upon invocation of the application, e.g.
       java -Djava.library.path=/usr/local/libjni

GLPK FOR JAVA CLASS LIBRARY

       The source code to compile the GLPK for Java class library is provided at http://glpk-java.sourceforge.net.

       The GLPK for Java class library can be compiled from source code. Follow the instructions in file INSTALL provided in the source  distribu-
       tion.  The usual installation path for the library is /usr/local/share/java/glpk-java.jar.

       The library has to be in the CLASSPATH. Specify the classpath upon invocation of the application, e.g.
       java -classpath /usr/local/share/java/glpk-java.jar;.

SEE ALSO

       Further documentation and examples can be found in the documentation path, which defaults to /usr/local/share/doc/libglpk-java.

version 1.0.18						       September 10th, 2011						   libglpk-java(3)
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